Bug 856763 - Build and deploy gcc 4.5.4 on all linux/linux64 build slaves. r=Callek

--HG--
rename : gcc45/centos6-i686/gcc45.spec => gcc45/centos6/gcc45.spec
rename : gcc45/centos6-i686/plugin_finish_decl.diff => gcc45/centos6/plugin_finish_decl.diff
rename : gcc45/centos6-i686/pr49911.diff => gcc45/centos6/pr49911.diff
rename : gcc45/centos6-i686/r159628-r163231-r171807.patch => gcc45/centos6/r159628-r163231-r171807.patch